I was hoping to see if you would clarify the marks as intentional or random just for your benefit. The brain is self-protecting to keeping secrets from ourselves. It does this to protect us, for we live in the conscious part.

Like newday says, not everyone is prone to dissociation, but when it comes to trauma, memories are very affected....to protect the conscious.

I've found that if there is some matter of concern over something, then it should be professionally addressed for better depth evaluation.